About safety i exactly don't know, cant tell you, but i know for sure that there are some same projects which are already running, so Xwin is not the first but one of the first.
I'd add they are one of the best as well, because I can see no prototype with the same astounding cryptobetting platform!
Maybe there are some similar projects, but the main idea and the best advantage is that all information about parlays, bets, games, prizes, winners, and results is written into XWINs smart contract and checked multiple times with several sources of information. It makes Xwin unique